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E — PUMP OPERATES BUT DELIVERS LITTLE OR NO WATER.
Cause of Trouble
1. System incompletely primed
2. Air lock in suction line
3. Undersized piping
4. Leak in air volume control or tubing
5. Leak on suction side of system
6. Low well level
7. Low water level in well
8. Defective or plugged foot valve and/
or strainer
9. Worn or defective pump parts or
plugged impeller
How to Check
When no water is delivered, check
prime of pump and well piping.
Check horizontal piping between well
and pump. If it does not pitch upward
from well to pump, an air lock may
form.
If system is low, the discharge piping
and/or plumbing lines may be
undersized.
Disconnect air volume control tubing
at pump and plug hole. If capacity
increases, a leak exists in the tubing of
control.
On shallow well units, install pressure
gauge on suction side. Close the
discharge line valve. Then, using a
bicycle pump or air compressor, apply
about 30 psi pressure to the system. If
the system will not hold this pressure
when the compressor is shut off, there
is a leak on the suction side.
Check well depth against performance
to make sure pump and ejector are
properly sized.
Shut off pump and allow well to
recover. Restart pump and note
whether delivery drops after
continuous operation.
Pull foot valve and inspect. Partial
clogging will reduce delivery.
Complete clogging will result in no
water flow. A defective foot valve may
cause pump to lose prime, resulting in
no delivery.
Low delivery may result from wear
on impeller or other pump parts.
Disassemble and inspect.
How to Correct
Reprime if necessary
Rearrange piping to eliminate air lock.
Replace undersized piping or install
pump with higher capacity.
Tighten all fittings and replace control if
necessary.
Make sure above ground connections
are tight. Then repeat test. If necessary,
pull piping and repair leak.
If undersized, replace pump or ejector.
If well is "weak",switch from shallow
well to deep well equipment.
Clean, repair or replace as needed.
Replace worn parts or entire pump.
Clean parts if required.
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